hyperion.ng/libsrc/leddevice/LedUdpDevice.cpp

// STL includes
#include <cstring>
#include <cstdio>
#include <iostream>
#include <exception>
// Linux includes
#include <fcntl.h>
#include <sys/ioctl.h>

#include <QStringList>
#include <QUdpSocket>
#include <QHostInfo>

// Local Hyperion includes
#include "LedUdpDevice.h"

LedUdpDevice::LedUdpDevice(const Json::Value &deviceConfig)
	: LedDevice()
	, _LatchTime_ns(-1)
{
	setConfig(deviceConfig);
	_udpSocket = new QUdpSocket();
}

LedUdpDevice::~LedUdpDevice()
{
	_udpSocket->close();
}

bool LedUdpDevice::setConfig(const Json::Value &deviceConfig)
{
	QHostInfo info = QHostInfo::fromName( QString::fromStdString(deviceConfig["host"].asString()) );
	if (info.addresses().isEmpty())
	{
		throw std::runtime_error("invalid target address");
	}
	_address = info.addresses().first();
	_port    = deviceConfig["port"].asUInt();
	
	return true;
}

int LedUdpDevice::open()
{
	QHostAddress localAddress = QHostAddress::Any;
	quint16      localPort = 0;

	WarningIf( !_udpSocket->bind(localAddress, localPort), _log, "Couldnt bind local address: %s", strerror(errno));

	return 0;
}

int LedUdpDevice::writeBytes(const unsigned size, const uint8_t * data)
{

	qint64 retVal = _udpSocket->writeDatagram((const char *)data,size,_address,_port);

	if (retVal >= 0 && _LatchTime_ns > 0)
	{
		// The 'latch' time for latching the shifted-value into the leds
		timespec latchTime;
		latchTime.tv_sec  = 0;
		latchTime.tv_nsec = _LatchTime_ns;

		// Sleep to latch the leds (only if write succesfull)
		nanosleep(&latchTime, NULL);
	}
	else
	{
		Warning( _log, "Error sending: %s", strerror(errno));
	}

	return retVal;
}